Datasheet

Electrical characteristics STM32L452xx
142/210 DocID029968 Rev 3
All I/Os are CMOS- and TTL-compliant (no software configuration required). Their
characteristics cover more than the strict CMOS-technology or TTL parameters. The
coverage of these requirements is shown in
Figure 25 for standard I/Os, and in Figure 25 for
5 V tolerant I/Os.
Figure 25. I/O input characteristics
Output driving current
The GPIOs (general purpose input/outputs) can sink or source up to ±8 mA, and sink or
source up to ± 20
mA (with a relaxed V
OL
/V
OH
).
R
PD
Weak pull-down
equivalent resistor
(8)
V
IN
= V
DDIOx
25 40 55 k
C
IO
I/O pin capacitance - - 5 - pF
1. Refer to Figure 25: I/O input characteristics.
2. Tested in production.
3. Guaranteed by design.
4. Max(V
DDXXX
) is the maximum value of all the I/O supplies. Refer to Table: Legend/Abbreviations used in the pinout table.
5. To sustain a voltage higher than MIN(V
DD
, V
DDA
, V
DDUSB
) +0.3 V, the internal Pull-up and Pull-Down resistors must be
disabled.
6. All TX_xx IO except FT_u and PC3.
7. This value represents the pad leakage of the IO itself. The total product pad leakage is provided by this formula:
I
To t al _I lea k_ m ax
= 10 µA + [number of IOs where V
IN
is applied on the pad]  I
lkg
(Max).
8. Pull-up and pull-down resistors are designed with a true resistance in series with a switchable PMOS/NMOS. This
PMOS/NMOS contribution to the series resistance is minimal (~10% order).
Table 71. I/O static characteristics (continued)
Symbol Parameter Conditions Min Typ Max Unit
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